using System;

using System.Linq;

using System.Reflection;

using Stuglxt_Models;

namespace ConsoleApp1

{

    public delegate int MydeleGate(int a, int b);

    class Program

    {

        static void Main(string[] args)

        {

            #region 委托与多播

            //Student student = new Student();

            //MydeleGate mydeleGate =(a,b)=> a+b;

            //dynamic result = mydeleGate(5, 2);

            //Console.WriteLine(result);

            //mydeleGate += student.Add;

            //result = mydeleGate==null? mydeleGate+=student.Sub:mydeleGate+=student.Add;

            //result=result(1, 2);

            //Console.WriteLine(result);

            #endregion

            #region 数组linq查询方法

            //linq

            //int[] nums = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

            //var item = from num in nums where num % 2 == 0 orderby num descending select num;

            //foreach (var i in item) {

            //    Console.WriteLine(i);

            //}

            #endregion

            #region 字符串linq查询方法

            //string[] nums = { "张**", "年*", "陈*", "刘*", "王*", "韩*", "吴*","年*" };

            //var list = nums.Where(item => item.Length == 2).Select(item => item).GroupBy(item => item.Substring(0, 1));

            //foreach (var item in list) {

            //    Console.WriteLine("-----------");

            //    Console.WriteLine("分组字段：{0}",item.Key);

            //    foreach (var k in item) {

            //        Console.WriteLine(k);

            //    }

            //}

            #endregion

            #region linq高级查询方法

            int[] nums = { , , , , , , , , ,  };

            //var Count = nums.Count();//获取元素个数

            //Console.WriteLine(Count);

            int[] nums0 = { , , , , , , , , ,  };

            //var list = nums.Skip(1).Take(3);//指定列跳过和选择指定项个数输

            //var list = nums.SkipWhile(i => i % 3 != 0).TakeWhile(i => i % 2 != 0);//跳过符合条件的数列和选取符合条件的数列

            var list = nums0.Distinct();//去重复

            foreach (var i in list) {

                Console.WriteLine(i);

            }

            #endregion

            Console.ReadKey();

        }

        class Student

        {

            public int Add(int a, int b) => a + b;

            public int Sub(int a, int b) => a - b;

        }

    }

}